261047651 has 2 divisors, whose sum is σ = 261047652. Its totient is φ = 261047650.

The previous prime is 261047627. The next prime is 261047653. The reversal of 261047651 is 156740162.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 261047651 - 2⁶ = 261047587 is a prime.

Together with 261047653, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (261047653) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 130523825 + 130523826.

It is an arithmetic number, because the mean of its divisors is an integer number (130523826).

Almost surely, 2^261047651 is an apocalyptic number.

261047651 is a deficient number, since it is larger than the sum of its proper divisors (1).

261047651 is an equidigital number, since it uses as much as digits as its factorization.

261047651 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 10080, while the sum is 32.

The square root of 261047651 is about 16156.9691155241. The cubic root of 261047651 is about 639.1065421882.

The spelling of 261047651 in words is "two hundred sixty-one million, forty-seven thousand, six hundred fifty-one".